Use of an extract from leaves of Ginkgo bilobafor the preparation of an agent and/or an extract from leaves of Ginkgo bilobaas agent for the treatment and prevention of the dementia syndrome and its early forms and preliminary stages, is claimed, where once daily, 180-300 mg of Ginkgo extractis administered. ACTIVITY : Nootropic; Neuroprotective; Antidepressant; Tranquilizer; Cardiovascular-Gen.; Hypnotic. MECHANISM OF ACTION : None given.